Cattleya black spots, cracked leaves

[Agnes Fodor]

Hi,

I have two Cattleyas and both stopped flowering then one of these now has cracked leaves and some strange black spots only around the edge of the leaves.

I assume it’s time to repot; how to fix the above issues?

The leaves do not seem to be pale to me so it’s probably not sunshine. I am suspecting low humidity and that I can fix but that would not explain the brown spots.

These are my first Cattleyas and I noticed their roots are darker than phals’ roots - I wonder if that’s ok or is their a problem.

Attached a few images too.

Many thanks,
Agnes